Patent GB-1182041-A (GB)
Title: Power Transmission Mechanisms
IPC: F16H3/095
Filed: 1968-01-17
Abstract: 1,182,041. Change-speed gearing. FORD MOTOR CO. Ltd. 17 Jan., 1968 [26 Jan., 1967], No. 2479/68. Headings F2C and F2D. In a motor vehicle change-speed gear wherein steps 43, 46, 48, 50 and 52, of three equiangularly spaced counter shaft gear clusters 44 respectively mesh an input gear 42, intermediate and low gears 68, 70 and 72, and a reverse gear 88 through idlers 74, the gear clusters 44 supporting the gears 68, 70, 72 and 88 without bearings, the gears 42, 68, 70, 72 and 88 are selectively connected to an output shaft 90 by a clutch sleeve 200 rotatably mounted on, but axially fast with, an axially slidable shift sleeve 116, the clutch sleeve 200 carrying a synchronized clutch member 214 having external clutch teeth co-operating with synchronizer rings 228, 232, 234 and 236 and with internal clutch teeth 218, 220 . . . 226 in the gears, the sleeve 200 being connected to the output shaft by a friction clutch 144, the friction discs of which are mounted on a hub 196 splined to sleeve 200 and on a member 140 splined at 136 to a sleeve 106 welded to a radial circumferential flange 110 on the output shaft 90. The discs are urged into light frictional engagement between a back plate 144 on member 140 and a presser plate 152 by a spring 206. The presser plate 152 is rotatable with a clutch ring 160, but is axially movable relative thereto. Balls 148 co-operate with cam recesses 146, 164 in the members 140 and 160 respectively to provide a torque responsive axial engaging force on the clutch plates. The clutch is disengaged by an operator pedal-controlled clutch collar 170, biased by spring 176 away from member 160, and carrying cam recesses 172 which, on leftward movement of collar 170, co-operate with cam projections on ring 160 to rotate the ring so that cam recesses 146, 164 coincide. Clutch release levers (182), (184), Fig. 2A (not shown), act on the collar 170 through ring 178 and needle bearings 180. The shift sleeve 116 includes two axially extending legs 122, (124), Fig. 5 (not shown), extending through openings (112), (114), Fig. 4 (not shown), in the flange 110 supporting sleeve 106, and carrying plates 126, 128 at their ends. A shift collar 136<SP>1</SP> is mounted between the plates and is axially movable by a manual power-assisted gear lever 266. Synchronization.-The synchronizer 214 on clutch sleeve 200 comprises a ring of clutch teeth formed on the sleeve and having plungers 212 spring-biased by a band spring 216 radially out of bores between the teeth, which teeth cooperate with internal teeth, e.g. 218, on the gears. Synchronizer rings, e.g. 228 are positioned between each pair of gears and have an external biconical friction surface co-operating with similar conical surfaces on the gears, and internal teeth formed with a central groove 230 co-operating with plungers 212. Gear shift.-To change gear, the clutch 144 is disengaged and the shift sleeve 116, and hence clutch sleeve 200, moved axially to obtain synchronized engagement of sleeve 200 and one of the gears, before re-engaging the clutch. The shift ring 136<SP>1</SP> is moved by a rod 240 having a pin-and-slot connection 246 with a lever 244 connected to the gear lever 266 by a U-shaped bracket 256 fast with lever 266 and having apertures in its legs in which freely engage projections 262, 264 on the lever 244, spring and ball 270, 272 maintaining the levers aligned. A power rod 282 is pivoted on the pin of the pin-and-slot connection, and is connected at its opposite end to the output arm 284 of an electric servomotor 286 activated on closing either of contacts 274, 284 or 276, 280, on pivoting of lever 266, to shift the sleeve 116. A clutch-pedal actuated switch is included in the electric circuit to prevent gear shifts unless the clutch is disengaged. The gears have double helical teeth to avoid axial thrusts.